Successfully installed Catalina on my PC but I have a lot of problems.

So first of all my Specs:

VGA: RX 570

CPU: I5 4440

8GB DDR3 RAM

Realtek Gigabit Ethernet

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Problems and questions:

- How can I now change my config.plist for the future?

-My screen is magenta. It's like something is wrong with RGB. My monitor is connected through HDMI. How can I fix this?

-I don't have sound, I used AppleALC. How can I uninstall AppleALC and install VoodooHDA to try if that works maybe?

-My secondary monitor is connected through VGA cable and it's black. I can't see anything on it.

I followed the openCore guide so no distros like Clover.

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Thank you so much for the help.